EP0671854B1 - Optical projection system - Google Patents

Optical projection system Download PDF

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Publication number
EP0671854B1
EP0671854B1 EP95103345A EP95103345A EP0671854B1 EP 0671854 B1 EP0671854 B1 EP 0671854B1 EP 95103345 A EP95103345 A EP 95103345A EP 95103345 A EP95103345 A EP 95103345A EP 0671854 B1 EP0671854 B1 EP 0671854B1
Authority
EP
European Patent Office
Prior art keywords
actuated mirrors
optical
array
mirror
white light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95103345A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0671854A1 (en
Inventor
Dae-Young Lim
Jin-Se Yang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WiniaDaewoo Co Ltd
Original Assignee
Daewoo Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1019940004518A external-priority patent/KR950027447A/ko
Application filed by Daewoo Electronics Co Ltd filed Critical Daewoo Electronics Co Ltd
Publication of EP0671854A1 publication Critical patent/EP0671854A1/en
Application granted granted Critical
Publication of EP0671854B1 publication Critical patent/EP0671854B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/3105—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators

Definitions

  • the present invention relates to an optical projection system according to the preamble of claim 1.
  • FIG. 1 there is illustrated such a prior art optical projection system 100 comprising non-point white light source 1, a Schlieren bar 2 provided with a plurality of reflective surfaces and corresponding number of slits, a source lens 3, a projection lens 4, a field lens system 5, a projection screen 6, a beam splitting means 7 including first and second dichroic mirrors 8, 9, and first, second and third arrays 10, 11, 12 of M x N actuated mirrors 13.
  • a white light emanating from the non-point white light source 1 is focussed along a first optical light path onto the reflective surfaces of the Schlieren bar 2 by the source lens 3, wherein the white light consists of first, second and third primary light beams, each of the primary light beams being a respective one of three primary colors.
  • the reflective surfaces of the Schlieren bar 2 are in a facing relationship with the source lens 3 and the field lens system 5.
  • the white light reflected from each of the reflective surfaces diverges along a second optical path and collimated by the field lens system 5, thereby being uniformly illuminated onto the beam splitting means 7 including the first and second dichroic mirrors 8,9, wherein the first dichroic mirror 8 is disposed between the field lens system 5 and the second dichroic mirror 9 facing the first array 10 of M x N actuated mirrors 13, and the second dichroic mirror 9, between the first dichroic mirror 8 and the third array 12 of M x N actuated mirrors 13 facing the second array 11 of M x N actuated mirrors 13.
  • the first dichroic mirror 8 receives the white light from the field lens system 5, reflects the first primary light beam of the white light to the first array 10 of M x N actuated mirrors 13, and transmits the second and third primary light beams to the second dichroic mirror 9, which, in turn, receives the second and third primary light beams from the first dichroic mirror 8, reflects the second primary light beam to the second array 11 of M x N actuated mirrors 13, and transmits the third primary light beam to the third array 12 of M x N actuated mirrors 13.
  • Each of the actuated mirrors 13 of the arrays 10, 11, 12 corresponds to each of the pixels to be displayed.
  • the optical path of the reflected primary light beams from each of the actuated mirrors 13 in each of the arrays 10, 11, 12 is determined by the amount of deflection thereof.
  • the reflected primary light beams from each of the undeflected actuated mirrors in each of the arrays 10, 11, 12 are focussed back to the Schlieren bar 2 by the field lens system 5 via the first and second dichroic mirrors 8, 9 along the second optical path and stopped by the reflective surfaces thereof, whereas the reflected primary light beams from each of the deflected actuated mirrors in each of the arrays 10, 11, 12 are focussed back to the Schlieren bar 2 by the field lens system 5 via the first and second dichroic mirrors 8, 9 along a third optical path so that a portion of the focussed light beams passes the slits thereof.
  • the primary light beams from each of the actuated mirrors 13 in each of the arrays 10, 11, 12 which pass through the slits are transmitted to the projection lens 4 which projects the transmitted primary light beams from each of the actuated mirrors 13 in each of the arrays 10, 11, 12 on the projection screen 6, thereby displaying each of the pixels corresponding thereto.
  • the document EP-A-0 139 991 shows a optical display device essentially comprising a light source and a Schlierin optical device for reflecting the light from the light source to a beam splitting means and a deformable mirror device.
  • the beam splitting means splits the light beam from the Schlierin device to two further deformable mirror devices and reflects the light beams reflected from these deformable mirror devices back to the Schlierin device.
  • the Schlierin device further reflects the received light beam onto a projection screen.
  • the Schlierin compromises alternating reflecting and transmitting portions for forming respective reflecting and transmitting optical paths.
  • the light beam incident on each deformable mirror device is filtered by a color filter and focused by a lens near to the corresponding deformable mirror device.
  • the light deflected by deformed mirrors of the deformable mirror device is reflected by the Schlieren device onto the projection screen.
  • the splitting means act together with the corresponding color filters to further split the light beam according to its color to the corresponding deformable mirror device
  • the document US-A-5,170,250 shows a projection apparatus having a light source, a source stopper, an optical reflecting means, a light valve arrangement, an aperture element, a projection lens and a projection screen.
  • White light emitted from the light source is shaped by the source stopper, reflected by the reflecting means on the light valve arrangement, transmitted through the reflecting means, the aperture element and the projection lens and project onto the screen.
  • One of the advantages of the invention is to provide for an optical projection system having a novel optical baffling means.
  • FIGs. 2 to 4 there are provided schematic views of the inventive optical projection system in accordance with preferred embodiments of the present invention. It should be noted that like parts appearing in Figs. 2 to 4 are represented by like reference numerals.
  • FIG. 2 there is illustrated a schematic view of the inventive optical projection system 200 comprising a non-point white light source 101, a source lens 102, a source stopper 103 provided with a light transmitting portion 51 having a specific configuration and a light stopping portion 61, an optical means 104 including a reflective surface 120, a beam splitting means 105 including a first and a second dichroic mirrors 106, 107, a trinity of arrays of M x N actuated mirrors 111 including a first, a second and a third arrays 108, 109, 110 of M x N actuated mirrors 111, a trinity of field lenses including a first, a second and a third field lenses 112, 113, 114, a projection stopper 115 provided with a light transmitting portion 52 having a specific configuration and a light stopping portion 62, a projection lens 116 and a projection screen 117.
  • an optical means 104 including a reflective surface 120
  • a beam splitting means 105
  • a white light emanating from the non-point white light source 101 is focussed along a first optical path on a first optical plane onto the light transmitting portion 51 on the source stopper 103 by the source lens 102 located between the non-point white light source 101 and the source stopper 103, wherein the white light consists of a first, a second and a third primary light beams, each of the primary light beams being one of the primary colors.
  • the source stopper 103 is used for shaping the white light from the non-point white light source 101 via the source lens 102 into a predetermined configuration by allowing a certain portion of the white light to pass through the light transmitting portion 51 thereof.
  • the white light from the source stopper 103 having the predetermined configuration travels onto the reflective surface 120 of the optical means 104.
  • the reflective surface 120 of the optical means 104 inclined at an angle, e.g., 48° - 50° with respect to the first optical plane, is in a facing relationship with the source stopper 103 and the beam splitting means 105.
  • the white light reflected from the reflective surface 120 of the optical means 104 travels along a second optical path, and is uniformly illuminated onto the beam splitting means 105 including the first and second dichroic mirrors 106, 107.
  • the second optical path is inclined 80° - 100° with respect to the first optical path 118.
  • the first dichroic mirror 106 inclined at an angle, e.g., 45°, and disposed between the optical means 104 and the second dichroic mirror 107 facing the first array 10 of M x N actuated mirrors 111, receives the white light from the reflective surface 120 of the optical means 104, isolates and reflects the first primary light beam of the white light to the first array 108 of M x N actuated mirrors 111, and transmits the second and third primary light beams to the second dichroic mirror 107.
  • an angle e.g. 45°
  • the second dichroic mirror inclined at an angle, e.g., 45° and disposed between the third array 110 of M x N actuated mirrors 111 and the first dichroic mirror 106 facing the second array 109 of M x N actuated mirrors 111, upon receiving the second and third primary light beams from the first dichroic mirror 106, isolates and reflects the second primary light beam to the second array 109 of M x N actuated mirrors 111, and transmits the third primary light beam to the third array 110 of M x N actuated mirrors 111.
  • Each of the actuated mirrors 111 in the arrays 108, 109, 110 includes a mirror 53 and an actuator 54 made of a piezoelectric material or an electrostrictive material which deforms in response to an electric field applied thereto.
  • Each of the actuated mirrors 111 in the arrays 108, 109, 110 corresponds to each of the pixels to be displayed.
  • Each of the first, second and third field lenses 112, 113, 114 located between the first dichroic mirror 106 and the first array 108 of M x N actuated mirrors 111, the second dichroic mirror 107 and the second array 109 of M x N actuated mirrors 111, and the second dichroic mirror 107 and the third array 110 of M x N actuated mirrors 111, respectively, is used for collimating each of the primary light beams from each of the dichroic mirrors 106, 107 in the beam splitting means 105 to thereby uniformly illuminating each of the primary light beams onto the corresponding array of M x N actuated mirrors.
  • the optical path of the reflected primary light beams from each of the actuated mirrors 111 in each of the arrays 108, 109, 110 is determined by the amount of deflection thereof.
  • the reflected primary light beams from each of the undeflected actuated mirrors in each of the arrays 108, 109, 110 are focused back to the projection stopper 115 by the corresponding field lens via the beam splitting means 105 and are stopped by the light stopping portion 62 of the projection stopper 115 disposed between the projection lens 116 and the optical means 104, whereas the reflected primary light beams from each of the deflected actuated mirrors in each of the arrays 108, 109, 110 are focused back to the projection stopper 115 by the corresponding field lens via the beam splitting means 105, along a third optical path so that a portion of the focussed primary light beams passes through the light transmitting portion 52 of the projection stopper 115 to thereby modulating the intensity of the primary light beams.
  • the optical path for each of the primary light beams between the optical means 104 and each of the arrays 108, 109, 110 of the actuated mirrors 111 must be of a same length. Furthermore, the optical path of each of the primary light beams traveling from the source stopper 103 to each of the arrays 108, 109, 110 of M x N actuated mirrors 111 and from each of the arrays 108, 109, 110 of M x N actuated mirrors 111 to the projection stopper 115 must be of a same length.
  • the source and projection stoppers 103, 115 are placed at the focal point of the field lenses 112, 113, 114 employed therein.
  • the light density of the optical projection system 200 is at its highest when all of the white light that passed through the light transmitting portion 51 of the source stopper 103 passes through the light transmitting portion 61 of the projection stopper 115, and this can be accomplished by making the light transmitting portions 51, 61 of the source and projection stoppers 103, 115 identical in shape and size.
  • the primary light beams from each of the actuated mirrors 111 in the arrays 108, 109, 110 which pass through the light transmitting portion 52 of the projection stopper 115 located at the focal point of the field lenses 112, 113, 114 are transmitted to the projection lens 116 which, in turn, projects the transmitted primary light beams onto the projection screen 117, thereby displaying each of the pixels to be displayed.
  • the inventive optical projection system 200 employs the trinity of field lenses 112, 113, 114, each of the field lenses being located between the first dichroic mirror 106 and the first array 108 of actuated mirrors 111, the second dichroic mirror 107 and the second array 109 of actuated mirrors 111, and the second dichroic mirror 107 and the third array 110 of actuated mirrors 111, respectively.
  • each of the primary light beams becomes less divergent and has a smaller beam diameter, and therefore, can be easily focussed, thereby eliminating a need for employing a complicated field lens system.
  • FIG. 3 a schematic diagram of the inventive optical projection system 200 incorporating therein an optical means 104 having a total mirror 54 capable of a total reflection of the white light from the source stopper 103 onto the beam splitting means 105.
  • FIG. 4 a schematic diagram of the inventive optical projection system 200 incorporating a polarization beam spitter (PBS) 55 and a ⁇ /4 plate 56, wherein the PBS 55 is used for separating the white light into a pair of polarization beams, a first and a second polarization beams, and reflecting one of the polarization beams to the ⁇ /4 plate 56, and the ⁇ /4 plate 56, upon receiving the reflected polarization beam from the PBS 55, is used for changing the phase of the reflected polarization beam from the PBS 55 and transmitting the phase changed polarization beam to the beam splitting means 105.
  • PBS polarization beam spitter

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Projection Apparatus (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Microscoopes, Condenser (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Lenses (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
EP95103345A 1994-03-09 1995-03-08 Optical projection system Expired - Lifetime EP0671854B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR1019940004518A KR950027447A (ko) 1994-03-09 1994-03-09 편광분리기를 이용한 투사형화상표시장치
KR9404518 1994-03-09
KR9404517 1994-03-09
KR19940004517 1994-03-09

Publications (2)

Publication Number Publication Date
EP0671854A1 EP0671854A1 (en) 1995-09-13
EP0671854B1 true EP0671854B1 (en) 2000-05-31

Family

ID=26630238

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95103345A Expired - Lifetime EP0671854B1 (en) 1994-03-09 1995-03-08 Optical projection system

Country Status (20)

Country Link
US (1) US5560697A (ru)
EP (1) EP0671854B1 (ru)
JP (1) JPH09510026A (ru)
CN (1) CN1070331C (ru)
AU (1) AU683542B2 (ru)
BR (1) BR9507021A (ru)
CA (1) CA2191131A1 (ru)
CZ (1) CZ263796A3 (ru)
DE (1) DE69517220T2 (ru)
ES (1) ES2146674T3 (ru)
HU (1) HU220537B1 (ru)
MX (1) MX9603948A (ru)
MY (1) MY111997A (ru)
PE (1) PE20196A1 (ru)
PH (1) PH31489A (ru)
PL (1) PL176882B1 (ru)
RU (1) RU2154352C2 (ru)
TW (1) TW260752B (ru)
UY (1) UY23932A1 (ru)
WO (1) WO1995024799A1 (ru)

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ATE349024T1 (de) 1994-08-04 2007-01-15 Texas Instruments Inc Anzeigevorrichtung
KR100220675B1 (ko) * 1994-10-31 1999-09-15 전주범 투사형 화상표시장치
US5575247A (en) * 1995-02-01 1996-11-19 Nippondenso Co., Ltd. Air intake device for an internal combustion engine
JPH09114022A (ja) * 1995-10-12 1997-05-02 Texas Instr Inc <Ti> プロジエクタ装置
TW357271B (en) * 1996-02-26 1999-05-01 Seiko Epson Corp Light regulator, display and the electronic machine
US5845981A (en) * 1997-12-29 1998-12-08 Philips Electronics North America Corporation Multi-color-band scrolling across single-panel light valve
US6394606B1 (en) 1998-09-29 2002-05-28 Sony Corporation Projection-type display device
JP2000194282A (ja) * 1998-12-24 2000-07-14 Daewoo Electronics Co Ltd 映像ディスプレーシステム
JP3372883B2 (ja) * 1999-01-08 2003-02-04 エヌイーシービューテクノロジー株式会社 プロジェクタ装置
WO2001002906A1 (fr) * 1999-07-02 2001-01-11 Matsushita Electric Industrial Co., Ltd. Dispositif de projection d'images
US6234634B1 (en) * 1999-07-28 2001-05-22 Moxtek Image projection system with a polarizing beam splitter
WO2003017653A2 (en) * 2001-08-17 2003-02-27 Cae Inc. Video projector and optical light valve therefor
WO2006072260A1 (de) * 2005-01-04 2006-07-13 Hentze-Lissotschenko Patentverwaltungs Gmbh & Co. Kg Strahlteileranordnung
TWI321661B (en) 2006-07-27 2010-03-11 Young Optics Inc Projection apparatus
CN101725900B (zh) * 2008-10-20 2011-09-28 鸿富锦精密工业（深圳）有限公司 光源装置及使用该光源装置的投影机
DE102011001785B4 (de) * 2011-04-04 2015-03-05 Jenoptik Optical Systems Gmbh Belichtungseinrichtung zur strukturierten Belichtung einer Fläche
CN104536245A (zh) * 2014-11-11 2015-04-22 深圳市亿思达科技集团有限公司 一种基于光纤布拉格光栅的激光投影机光源系统
CN109141835B (zh) * 2018-09-28 2019-12-24 中国兵器工业标准化研究所 投影及纹影二合一光学测试系统
CN115576166A (zh) 2020-03-12 2023-01-06 中强光电股份有限公司 照明系统及投影装置
CN113391507B (zh) * 2020-03-13 2022-07-19 中强光电股份有限公司 光源模块与投影装置

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JP2681304B2 (ja) * 1990-05-16 1997-11-26 日本ビクター株式会社 表示装置
US5170250A (en) * 1991-02-06 1992-12-08 Hughes Aircraft Company Full-color light valve projection apparatus having internal image registration system
US5268775A (en) * 1991-02-19 1993-12-07 Hughes-Jvc Technology Corporation Contrast enhancement and ghost elimination, for reflective light valve system
GB9107144D0 (en) * 1991-04-05 1991-05-22 Rank Cintel Ltd Recording video signals on cinematographic film
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JPH0553224A (ja) * 1991-08-27 1993-03-05 Pioneer Electron Corp カラー液晶表示装置
GB9204798D0 (en) * 1992-03-05 1992-04-15 Rank Brimar Ltd Spatial light modulator system
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Also Published As

Publication number Publication date
DE69517220T2 (de) 2000-10-12
PL316171A1 (en) 1996-12-23
CZ263796A3 (cs) 1998-01-14
PE20196A1 (es) 1996-08-11
AU683542B2 (en) 1997-11-13
ES2146674T3 (es) 2000-08-16
HU9602461D0 (en) 1996-11-28
TW260752B (ru) 1995-10-21
CA2191131A1 (en) 1995-09-14
BR9507021A (pt) 1997-09-09
MX9603948A (es) 1997-06-28
HUT76500A (en) 1997-09-29
JPH09510026A (ja) 1997-10-07
MY111997A (en) 2001-03-31
WO1995024799A1 (en) 1995-09-14
PH31489A (en) 1998-11-03
PL176882B1 (pl) 1999-08-31
RU2154352C2 (ru) 2000-08-10
CN1144027A (zh) 1997-02-26
UY23932A1 (es) 1995-05-14
US5560697A (en) 1996-10-01
CN1070331C (zh) 2001-08-29
DE69517220D1 (de) 2000-07-06
HU220537B1 (hu) 2002-03-28
AU1961495A (en) 1995-09-25
EP0671854A1 (en) 1995-09-13

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